Round molded gyratory bolter sieve



Feb. 26, 1952 A M MARSH ROUND MOLDED GYRATORY BOLTER SIEVE 2 SHEETS-SHEET 1 Filed June 16, 1949 INVENTOR. W (Z502/& m4! firrofiA/z'ys.

Feb. 26, 1952 A. M. MARSH ROUND MOLDED GYRATORY BOLTER SIEVE Filed June 16, 1949 INVENTOR. Q ZflMf/WZ. $425620 W A TWO/ENEQIS l mmun I Iii? fine soreening, a layer of back wire below-"the Patented Feb. 26, 1952 PATENT oss-1 cs 2,587,498 novnnmomnnsymronr 150mm Marsh, Wauwatosa, Wis.

Applicatflm am 111:,51949, Serial Nassnm "rh svrnrveniaion relates in general to wide an wormed halter sieve assemblag is slmiale, compact and durable in constru in adaptions, and highly 'eificien t. flongz he'en commonpractice. in the seas grain and for separating the wholesome into dilieren-t grades. Each-oi these bolters. jqr nafily consistsoi as mnnber of simila stacked upon each other, each sieve 1111 v prising a rectangular or square warmer-1f e provided with an "upper layer of bolti mg cloth or scream-Tm oonfi n'ing one or more freely a-ble leaners in arexmri-ty to the lower surface or eaofi screenaand' a man disposerl'fbeneath the back w iredm conducting the material-whisk passes through-each screen and back wire rom the adjacent zone of separation upper 'extrem ity'of' each stack is provided material supply means, while the lower en dfis likewise prov ided 'with flexible conduits for-disto cause the material to constantly travel downwardly over the successivesdperimposed soreensot ea'ch stack. "Because of the: wooden construction of the sieve frames;

the joints cannot he maintained. tight means ."are'wnecessarily confined :within hrilkyjsiev a ,l

invention Ito provide an mproved ibolter sereenandpanasser-nblage consistingzoiseparable upper screen and lower pan sectionsadapted in be snngly superimposed tor readily separated, :and roamed o! i liglitanoolded substance so as to stres tively confine screen and raeamof aeach;

in normal position was permitting eon;- wanlent-lnsertion or removal oi these and woes:- in all other lmrtions ot the: structure.

' ohziect 'obthlsinwentlon 1511170 provide. ea

8 01am. X01. ans-anal clrctilarsieve unit which b sidesfibeing strong and adapted #to withstand temperatures, can be readily cast and/or machinedrto eliminate loose joints and to avoid corners whereinmateriail can accumulate and cansefziniestation, and whereby the successive may be conveniently adjusted by turning them about "a central to provide for variable discharge urine-separated particles.v ;.;l" v A; Ins-therobieot of'the invention is to provide a unitary screen and pan assembly winch may liestacked and groan ro'r' gyration without necessity tor providing a- 'senarate enclosure 01'' sieve box, and wherein leakage and escape of finemnaterial -dne shrinkage and warning of the frames is substantially ayoided.

mther objectpfmy'finvention is to provide an improved bolter sieve formed of a minimum nmnher of rigid parts which may :be readily constructed and assembled so :as to insure an airtight and highly sanitary jsieve stack adapted to be readily positioned" 'a-pgroup with similar stadks 101' vibrationwith the aid of common actuathrgmechamism. I

An additional object of the present invention 3 to provide a sieve frame and pan unit in which the sieve and bank wire may be detachably 'confined without use golf tacks or other fastening elements which are a to become dislodged and mixed with themater and wherein the materlal passing from 5 separating :zone to the next screen :is not dropped directly upon the screen sloth but is va,"radua-lly spread thereover 1mm a side shelf thus eliminating clogging of the sieve perforations and:.blanketing of a large area of the screen dfickggWi-bh a thick layer of material. 1

Another object ofrthi invention is to provide anovelwgyratory halter s eve assemblage in which the deck and an may be disposed or :iomned'so as to \hastenfithe advanQ-ment of the material the bolter, thus ins ningi man' oaaaacity with 'tlre-nase of relatively small stewer screening units.

A further object of my present invention isto provide :a bolterirsieve unit which when stacked and, properly grouped? will occupy height and and which is also adapted :lor cooperationlof other similar units so as to pro-'- duce amaximnm number of separate grades of product with. the aid of a minimum number or theiunits; y

:Sti'llnnoth'er object oftherinventlon sjto providemindividual sleveztrame-rand 31a 'sembly 3 tions formed of cast metal or plastic, and which coact to confine, the screen and back wire in a manner whereby these elements are readily renewable and the cleaners are conveniently accessible.

An additional object of this invention is to provide a round bolter sieve unit which is adapted for either right or left hand delivery of the separated materials without alteration, and wherein all outlets for the product are easily accessible, while the round construction also facilitates di versified grouping or nesting of the stacks of sieve units.

Another object of my invention is to provide an improved round moulded bolter sieve which may be manufactured in quantity at moderate 2,587,498 a T R?" EV unit,-is'-provided'with .an externally tapered square rigid frame I! having a sieveor-screen l8 of finewire or silk secured to its 'top and a cost in the form of readily cooperab le and in-;

terchangeable units, and which is also self-cleaning so as to maintain sanitary conditions therein at all times. T

'- :T-hese -"and other objects and advantages of the invention will be apparent .from'the follow-,-

ing detailed description. 1 ;A clear conception of ,the, features constitute ing; the present improvement, and of the -'con-' struction and-operationof several typical;,.com,-; merlcial,=,.embo.diments of the invention, {may be hadbyqreferring to .the drawings accompanying and forming a part of this specification Where-1 in like reference characters designate thesame or similar parts in the various views. 1. Fig; 1 is a top view. of, three iower, sections of a' stack of the improved round sieve and pan units, viewed at the line ll of Fig.2, portions of upper sections having been broken away to reveal structure of lower sections; 1 Fig. 2 is a central vertical section throughthe stack of sieve andpan units shown in Fig. 1, showing three complete units-or six sections, and the section being taken along ;the line 2'-2 of -.Fig. 3 is another central vertical section through the same stack assembly; taken at'right angles to thatof Fig. 2 and along the line S -3 of-Figl;

M Fig. 4' he somewhat reduced top view of a modified upper'screen section having each :seg mental material conducting jopening' divided into twozadjcining parts;

'Fig; 5 is 'a likewise reduced top view of a modified lower pan section adapted for cooperatio with -theupper section ofFig. 4; and i: Fig; a considerably enlarged fragmentary section and partial: elevation of the lowermost corner of astack showing' details of construction" of the bolter sieve assembly.

While the invention has been shownand' 'de-- scribed as being especially advantageously applicable to square sieve flour b'olters of the gym-'- tory" type,'it is not mydesire or intention to restrictthe infizroved features to such construetion? and .use; and -it.iis also contemplated that specific'des'criptive termsused her'in'be given the broadest possible interpretationconsistent with the'-disclos'ure'.. 1' J '1' A v1' Referring to Figs. 1;2, 3 and'6 of the "drawing, the typical gyrator'y bolter. assemblage shown therein by way of illustration comprisesnr'gen eral an upright stack of superimposed'compos itevu'nits resting upon a special circular onepiece supporting base '8, each of the' units coir-I sisting .of an upper one-piece circular frame sec-' tion 9 having a square 'or" otherwise polygonal screen assembly lfl" disposed centrally thereof, anda lower .one -p'iece circular framesection ll back wire ;l9- of metal or plastic and of relatively large mesh secured to its bottom, preferably without the aid of tacks, staples, or other similar fasteners. The, upper frame section 9 of each unit, has a series-.of-inner cord-like walls 2|] formed integral-withits rim M to provide. av square internally tapered recesszl .within which thefscreen frame I! is upwardly-*insertible, and as shown..:in Fig. 6, the edges of .the screen l8. are bentfidown while the edges of the back awire i9 are-bent up so'that all of ,these edges are firmly clamped between the frame: I! and the adjacent walls 20 when-.thescreen;assembly-is inserted within its confining recessZl. One-or more universally movable screencleaners 22:01 well known constructiomgare normally confined within each .screenassembly 10 ;;between the sieve I8 and the back wire 19 thereof, as depictedin Figs. 2 and-:3,- and these cleaners 22 travel along the back wires and coact with the lower surfaces-of the sieves. The integral cord-like ;walls 20-- of the screen framesections 9 are spaced fromthc adjacent peripheral rimsyM iso as--.- to provide segment shaped materialdeli-very openings extending downwardly through the sections 9; ,-and one of these openings inj each section 9 is either completely or partially closed and covered-by a feed plate or platform 25 also formed-integral with the section and disposed in approximate horizontal alinement with the adjacent sieve deck orscreen I8, as shown in Figs...1, -2 and 4. The square pans [2 which are formed integral with the lower. section -I I; may beinclined slightly towardstheir discharge openings 23 as illustrated inFigs. 3 and -6,- and-are each provided on their other three sides with integral-walls 26 the upper edges of which are snugly cooperable-with the lower edges of the adjacent screen section walls: 20-so-asw-to'seal the spaces-beneath the back Wires l9. from the spaces directlyabovetheifine screens l8.,.1The; pan walls. 26-also cooperate with theadjacent peripheral rims I4 of. the sections H to provide segment shaped material delivery openings 12! extending downwardly through the pan sections and adapted to be disposed in vertical alinement and communication with. the similar: openings .ingthe screen sections--9 and in. they modification of Figs. 4 andv 5 the openings 24' are; each divided into two parts by, a partition 34 formed integral with the sections 9,'H As previously'indicated, the successive screen andpan sections 9, l0 may be stacked upon' each other-to provide aseries of'superimposed compositegunit'syand the successive sections 9,? ll-.of each stack'may be relatively adju'sted.ab0ut"the stack axis soas'to, cause any-of-the material discharge openingsdl-of' the upper sections 9 to conmmnicate openly with any of the .corre-I spondingj 'openings 21 of the adjacent lower section I0.,3When such adjustment has been eifectedtjand the two sections 8., @1 0 have been brought gtogether, the screen assemblage of the uprper section .8 will be locked in position within the tapered central opening by the adjoining flower section EM"; andithe 'coa'ctin'g sectionsgB, J10 ofrthe' unitimay bezfixed against subsequent displacement either by means. of dowel pins applied to registering holes 21 shown in Riga-1, 4 and or by means of ridges: :28 on the bottom of each section. 19 10 and coacting with "grooyes. 2-9 at the-top of the next lower section as in.v Fig. 6. The :supportingxhase 8. for each'stackof sections '9... in is ailsoprovided with. cord-like ;walls 3t cooperating with the. lower ends :of the walls 20 of the lowermost screen sections and the base section 8 is moreover providedawith material discharge, openings- 31 and within-.tegralsuspensionears- 32 radiating from its peripheral rim, as illustrated in; Figs. 1, 4. 5 and 6.. {These ears serve to: support thestacks .in. groups Ior-gyration in a well known manner. I

When the screen. sections-=9 and-:pan sections H have been constructed as above. described,

they are interchangeably cooperable and may be stacked upon a base. 8 so as to superimpose four of the composite units upon each other. One or more of these stacks may. be suspended from ordinary gyrating or vibrating mechanism with the aid of the ears 32 of, the supporting bases 8 in a wellknownmanner, and after the outlet openings, 3! have been connected to the usual flexible discharge conduits and the screen or bolter stacks are being gyrated, material to be treated may be fed upon the uppermost feed platforms .25 and will thereafter advance over the uppermost screen decks or sieves l8 and in the direction of the dot-and-dash arrows indicated in Figs. 2 and 3. The rejects from the upper screen l8 will drop by gravity upon the succeedingf lower feed platforms through the discharge jopenings 24 and over the succeeding lower screens, :18 as shown in Fig. v2 and will ultimately. be delivered fromeach stack through the lowermost right-hand discharge opening .31. The material which passes throughthe successive screens-'l'fl'will drop upon the adjacent pans I2 asshown in Fig. 3 and; will be deliveredpby these inclined pans into the vertically alined discharge openings 24 at the-left being ultimately discharged by, gravity through the left hand opening 31. along their supporting back wires l9 andwill brush and; vibrate the adjacent screens I8 so, as to prevent possible clogging of the screenfperforations during normal operation.

Because of thecircular formation of the frame andbase sections 8.. 9.. ll. these sections may be readily adjusted about the, central axis. of each upright stack so as to cause the screen rejects and the product passing through the screen perforations to be delivered into any of the openings 24 thus making it possible to produce numerous grades of final product with the aid of a minimum number of the composite'screen and pan units. The number of grades of product may also be increased by providing partitions 34 within the openings 24 as in Figs. 4 and 5, and the feed platforms 25 avoid clogging of the screen perforations by preventing delivery of thick layers of fine material from the upper screen decks directly upon local areas of the lower The cleaners 22 will ride or travel r decks. The one-piece circular'rormation of the" tween-the adjoining sections at the peripheral rims l4 and walls 20, 26.,but also permits eIimination of corners and pockets in which material might accumulate and produce infestation. The tapered formationof the screen frame receiving recesses .21 also enables convenientv insertion and removal of the screens and firm retention of the sieve cloth I18 and back wire .[9 without theaid of-separazte fastenings such as tacks, and furthermore provides for convenient access to the cleaners 22 and internal surfaces.

From the foregoing detailed description, it will be apparent that my present invention provides an improved gyratory .bolter sieve assemblage, which by virtue of its round and molded constructionis in fact exceedingly simple and compact construction, and highly efficient in operation while also being flexible in its .adapta-- tions. The tight Joints afforded by the .coacting tapered surfaces l5 and bores 16 of the superimposed sections, make .itunnecessary to provide special sieve boxes such as used withiprior .bolters, and the one-piece molded construction :of. the sections 9, l I and base-.8 not only provide a much stronger frame structure but also produce a far more sanitary and readily cleanable asseriiblv in which all parts; are conveniently accessible for thorough cleansing. By forming these frames of'metayl, they may also be utilized to withstand high temperatures, and the round frame structures can also be accurately machined and finished to produce tight joints between the adjacent stacked sections. Thev round, rims .14 cooperate; with the square screens ID to permit adjustmentv by quarter-turns. and either the dowel pins openings 2! or. the ridges 28 may :be utilized to hold the sections in the desired positions of adjustment.

The construction of Figs. 1,. 2 and 3 may bev utilized to produce five separations, while the modified structure of Figs. 4 and 5 may be employed to produce nine independent products.

The round construction also facilitates close nesting of a group of two, three, four or more stacks of the sections, and also provides material delivery passages 24 of. large cross-section thus enhancing the capacity and avoiding accumulation of product therein. The improved. screen and pan units may also be produced in quantity at relatively low cost, and may be manufactured in various sizes for diverse uses.

It should beunderstood that it is hot desired to limit this inventionto the exact detailsof construction or to theljprecise mode of use of the bolter units herein shown anddescribed; forvarious modifications within the scope of the appended claims may occur to persons skilled in the art.- a

I claim: I

l. Ina sieve assemblage, a unitary upper frame section havinga circular peripheral rim and a series of integral walls forming a square central opening within the rim, a unitary lower frame section also having a circular peripheral rim snugly interlockably cooperable with said upper section rim and being provided with an integral square pan bounded on three sides by walls snugly cooperable with said upper section walls, and a separable screen confined within said upper section opening by said lower section.

2. In a sieve assemblage, a unitary upper frame sectionhaving a circular peripheral rim and a series of integral walls forming a square central opening within the rim bound by upwardly and inwardly tapered surfaces, a unitary lower frame section also having a circular peripheral rim snugly interlockably cooperable with said upper section rim and an integral square pan bounded on three sides by walls snugly cooperable with said upper section walls, and a separable screen bounded by tapered surfaces confined within said upper section opening surfaces by said lower section, said screen having an upper sieve deck and a lower back wire disposed in horizontal alinement respectively with the upper and lower edges of said upper section walls.

3. In a sieve assemblage, a unitary upper frame section having a circular peripheral rim and a series of integral walls forming a squarecentral openingwithin the rim bounded by upwardly and inwardly tapered surfaces, a unitary lower frame section also having a circular peripheral rim snugly interlockably cooperable with said up per section rim and an .integral square pan bounded on three sides by walls snugly cooperable with said upper section walls, and a separable screen bounded by upwardly and inwardly tapered surfaces confined within said upper sec tion opening by said lower section, said upper sectionwalls and rim cooperating to provide a series 0f segment shaped material discharge openings surrounding said screen and one of said discharge openings being covered by a feed platform disposed in horizontal alinement with the top of said screen. 7

' 4. In a sieve assemblage, a unitary upper frame section having a circular peripheral rim and a series of integral walls forming a square central opening within the rim, a unitary lower frame section also having a circular peripheral rim snugly interlockably cooperable with said upper section rim and an integral square pan bounded on three sides by walls snugly cooperable with said upper section walls, and a separable screen insertible only from beneath said upper section and confined within said upper section opening by said lower section, said upper and lower sections being relatively adjustable about their central vertical axis to vary the relative positions of said screen and pan. 5. In a sieve assemblage, a unitary upper fram section having a circular peripheral outer rim and a series of integral inner walls forming a square central opening within the rim, a unitary lower frame section also having a circular peripheral outer rim and an integral square cen tral pan bounded on three sides by walls vertically alineable with said upper section walls, and a separable screen confined within said upper section opening above said pan by said lower section walls.

6. In a sieve assemblage, a unitary upper frame section having a circular peripheral outer rim and a series of integral inner walls forming a square central opening within the rim, a unitary:-

lower frame gsectionjalso having a circular peripheral outer rim and an integral square central-pan bounded on three sides by walls vertically alineable with said upper section walls, and a separable screen confined within said upper section opening above said pan by said lower section walls; said upper section rim being bounded bya downwardly and inwardly tapered outer surface snugly 'cooperable with a similarly tapered bore formed in said lower section rim to centralize said frames. 1

. 7. In a sieve assemblage, a unitary upper frame section having a circular peripheral outer'rimand a series of integral inner w'alls forming a square central opening within the rim, a unitary lower frame section'also'having'a circular peripheral outer rim and an integral square central pan bounded on three sides by walls vertically alineable with said upper section walls, and a separable screen confined within'said upper section opening above said pan by said lower section walls, said upper section opening being bounded by an upwardly and inwardly tapered surface and said screen being bounded by a similarly tapered surface wedgingly cooperable with said opening bounding surface.

.' 8. 'In a sieve assemblage, a unitary upper frame section having a circular peripheral outer rim and "a series of integral inner walls forming "a square central opening within the rim, a-unitary lower frame section also having a circular peripheral outer'rimand an'integral squarecentral pan' bounded on three sides by walls verti-' cally alineable with said upp r section walls-and a separable "screen confined within'said upper section opening above said pan by said lower section walls, said upper section rim being bounded by a tapered outer surface wedgin'gly cooperable with a tapered bore formed in said lower section rim and said upper section open ing being bounded by another tapered surface" wedgingly cooperable with a tapered bounding surface formed on said screen.

s I ALBERT M. MARSH?" REFERENCES CITED I The following re ferenc es are. of record in the file of this patent; H I

UNITED s'rsrss PA ENTS Date Number I I 'Name 111 ii 7 641,986 McAnulty Jan. 23, 1900 696,831 Marmon -'Apr. 1, 1902 758,907 Fraser et al. May 3, 1904 784,859 Hunt I. Mar. 14, 1905 864,174 Lande's et al i Aug. 27, 1907' 1,120,012" Bell r Dec.-8, 1914 1,141,727 Seaman June 1, 1915 1,407,601 Thompson Feb. 21, 1922- 1,863,291 Weston '"June14, 1932 2,191,923- 'Ceeka 1 Feb. 27, 1940 2,455,383 

